Tell off sloppy call centre revealing star-sign (6)

I believe the answer is:

cancer

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'sign' is the definition.
(sign of the zodiac)

I don't understand the remainder of the clue.

(Other definitions for cancer that I've seen before include "Malignant growth and sign of the zodiac" , "Zodiac sign of the Crab" , "Constellation between Gemini and Leo" , "Crab star sign" , "Fourth sign of the zodiac" .)

I've seen this clue in The Irish Times.

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